Supermarket cashiers

When only two checkouts are open in a supermarket, people wait in line for an average of 12 minutes. How much will the average waiting time in line be reduced if they open three more ticket offices?

Correct answer:

x =  7.2 min

Step-by-step explanation:

2:(2+3) = d:12  d=12 2+32=524=4.8 min  x=12d=12524=512 5524=560524=56024=536=536 min=7.2 min

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